A precise and consistent assay for major wall polymer features that distinctively determine biomass saccharification in transgenic rice by near-infrared spectroscopy

文献类型： 外文期刊

第一作者： Huang, Jiangfeng

作者： Huang, Jiangfeng;Li, Ying;Wang, Yanting;Chen, Yuanyuan;Liu, Mingyong;Wang, Youmei;Zhang, Ran;Zhou, Shiguang;Li, Jingyang;Tu, Yuanyuan;Hao, Bo;Peng, Liangcai;Xia, Tao;Huang, Jiangfeng;Li, Ying;Wang, Yanting;Chen, Yuanyuan;Liu, Mingyong;Wang, Youmei;Zhang, Ran;Zhou, Shiguang;Li, Jingyang;Tu, Yuanyuan;Hao, Bo;Peng, Liangcai;Xia, Tao;Huang, Jiangfeng;Li, Ying;Wang, Yanting;Chen, Yuanyuan;Liu, Mingyong;Wang, Youmei;Zhang, Ran;Zhou, Shiguang;Li, Jingyang;Tu, Yuanyuan;Peng, Liangcai;Liu, Mingyong;Hao, Bo;Xia, Tao;Li, Jingyang

作者机构：

关键词： Transgenic plant;Rice;Biomass saccharification;Plant cell wall;Near infrared spectroscopy;Bioenergy

期刊名称：BIOTECHNOLOGY FOR BIOFUELS （ 影响因子：6.04； 五年影响因子：6.485 ）

ISSN： 1754-6834

年卷期： 2017 年 10 卷

页码：

收录情况： SCI

摘要： Background: The genetic modification of plant cell walls has been considered to reduce lignocellulose recalcitrance in bioenergy crops. As a result, it is important to develop a precise and rapid assay for the major wall polymer features that affect biomass saccharification in a large population of transgenic plants. In this study, we collected a total of 246 transgenic rice plants that, respectively, over-expressed and RNAi silenced 12 genes of the OsGH9 and OsGH10 family that are closely associated with cellulose and hemicellulose modification. We examined the wall polymer features and biomass saccharification among 246 transgenic plants and one wild-type plant. The samples presented a normal distribution applicable for statistical analysis and NIRS modeling. Results: Among the 246 transgenic rice plants, we determined largely varied wall polymer features and the biomass enzymatic saccharification after alkali pretreatment in rice straws, particularly for the fermentable hexoses, ranging from 52.8 to 95.9%. Correlation analysis indicated that crystalline cellulose and lignin levels negatively affected the hexose and total sugar yields released from pretreatment and enzymatic hydrolysis in the transgenic rice plants, whereas the arabinose levels and arabinose substitution degree (reverse xylose/arabinose ratio) exhibited positive impacts on the hexose and total sugars yields. Notably, near-infrared spectroscopy (NIRS) was applied to obtain ten equations for predicting biomass enzymatic saccharification and seven equations for distinguishing major wall polymer features. Most of the equations exhibited high R-2/R-cv(2)/R-ev(2) and RPD values for a perfect prediction capacity. Conclusions: Due to large generated populations of transgenic rice lines, this study has not only examined the key wall polymer features that distinctively affect biomass enzymatic saccharification in rice but has also established optimal NIRS models for a rapid and precise screening of major wall polymer features and lignocellulose saccharification in biomass samples. Importantly, this study has briefly explored the potential roles of a total of 12 OsGH9 and OsGH10 genes in cellulose and hemicellulose modification and cell wall remodeling in transgenic rice lines. Hence, it provides a strategy for genetic modification of plant cell walls by expressing the desired OsGH9 and OsGH10 genes that could greatly improve biomass enzymatic digestibility in rice.

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